Is @Æthelberht another victim of "Y, Somme, Picardie, France" syndrom (death location)? Seems probable to me.
(http://ysommepicardiefrance.blogspot.com)
--Paul Elseth
This might also be some sort of same kind of mistakes,
Aethelbert II Billung, Graf in Sachsen
Born: cirka 685
Billung, Germany
Died: Kent, UK
But if we look on this site called Roskildehistorie, http://www.roskildehistorie.dk/stamtavler/konger/3_Valdemarer/Billu... they clearly only stated this, "Kendt 665", which actually only means, KNOWN in the year of 665, just imagine how many norwegians and danes also writing "ukendt" = unknown, in their profiles, which also easily can be confused with either UK Kent, or mistaken as an actual partners name: okänt, ukendt, ukjent, ekki vitað, just means that their names are unknown.
There was an Aethelbert of Kent, probably where your Graf picked up locations
https://en.wikipedia.org/wiki/Æthelberht_of_Kent
http://justus.anglican.org/resources/bio/4.html